A ratification of the Convention is based on a transposition of the requirements of the Convention into national legislation. This can be achieved by including the necessary transboundary considerations into the national EIA legislation, wherever such legislation exists. The requirements of the Convention may also be included in different pieces of legislation, e.g. those covering environmental protection or physical planning.
The transposition of the requirements of the Convention ensures that national authorities organise the practical application of the Convention. The requirements of the Convention can be further strengthened and clarified by specifying in primary or secondary legislation issues such as the responsibilities of different authorities and the rules of procedures of joint bodies. The national legislation may thus help the other Parties to understand the relationship of a Party to the requirements of the Convention and helps in identifying links between the EIA procedures of the Parties.